The fragmented remains of a massive public bath connected to the city's water supply.

At least according to the Guinness World Records.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

This colorful gate stands as an entrance to the walled city of Old San Juan.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

Considered by many to be one of the most dangerous highways in Alaska.

A trading post in the North Pole where children send letters.

This tiny square mile of Canadian sand was once considered the world's smallest desert.

The picturesque remains of an abandoned silver mine slope down to Tagish Lake in the Yukon.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

A historic freight system that found the true gold rush is in tourism.

Originally a brothel during the Klondike Gold Rush, this bar once used dolls to denote when ladies were working.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

A monument commemorating the role of Alaska's native Tlingit guides in the Klondike Gold Rush.

The easternmost town in Alaska can only be accessed from Canada.

Roadside collection of 65,000 signs.

The king of U.S. high points towers over every other peak on the continent.

On this tiny spot of land in the middle of Lake Titicaca the only ones who do the knitting are the men.

The Uros people live on floating reed islands in lake Titicaca.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.